Ray J -- Charged with 4 CRIMES ... D.A. Files Sexual Battery, Cops Disagree

The L.A. County D.A. has thrown the book at Ray J ... charging him Monday with 4 CRIMES in connection with his drunken antics last May ... and get this -- the D.A. charged Ray J with sexual battery even though cops say no such crime was committed.

Ray J was at a bar at the Beverly Wilshire Hotel when he got rowdy, brushed up against a woman's ass and was ordered to leave. Police told TMZ at the time it was NOT sexual battery because the contact was "incidental" -- not intentional. Apparently the D.A. begs to differ.

Ray J left the bar and then went nuts in an alcohol-fueled rampage. He was arrested, kicked out the window of a cop car and spit on an officer. Ray J told TMZ ... he kicked out the window because he was claustrophobic.